One of the top - if not the top - European Americana Festivals. I must declare a vested interest, as my band are playing there, but I've been as both a punter and a performer and it's equally brilliant.
This year's line-up can be seen here - http://www.kilkennyroots.com/
But if you can't be bothered to click on the link, here's the listing -

2009 Performers
Jim White USA
Rev. Peyton's Big Damn Band USA
Luke Doucet and The White Falcon Canada
Caroline Herring USA
Devon Sproule USA/Canada
Peter Broderick USA
Otis Gibbs USA
Hillbilly Casino USA
The Jim Jones Revue UK
Liz Durrett USA [details]
Melissa McClelland Canada
Rev Peytons Big Damn Band/Hillbilly Casino USA
The Pilgrim Sisters Sweden
The Jack Grace Band USA
Elvis Fontenot & The Sugarbees UK
Wynntown Marshals Scotland
The Lost Brothers Ireland
Down & Out Greece
Prairie Dawgs Ireland
Ben Reel Band Ireland
River Valley Band Ireland
Rumbleshack Ireland
Blues Ark Ireland
Cotton Pickin Rodeo Clowns Ireland
Tupelo Ireland
TV Jones and The Tomahawks Ireland
Niall Toner Band Ireland

The MySpace site gives a list of previous performers and other details -
www.myspace.com/kilkennyrhythmandrootsfestival

Anyone going? Come and say hi if you are!